Vibratory motor



Nov. 1, 1960 s. D. ALVORD 2,958,792

VIBRATORY MOTOR Filed June 25. 1957 il- 'll 10113227111 1N VENTOR. GEOVE 0. AL V020 14/5 ATTOEMEY United StatesPatentOfice 2,958,792 Patented 'Nov. 1, 1960 VIBRATORY MOTOR Grove D. Alvord, Indiana, Pa., assignor to Syntron Company, Homer City, Pa., a corporation of Delaware Filed June 25, 1957, Ser. No. 667,804

4 Claims. (Cl. 310-28) This invention relates generally 'to vibratory motors and more particularly to a vibratory motor that is small, inexpensive and compact in design.

Small vibratory motors on the present market have a considerable number of parts making them expensive to manufacture. They are also difficult to tune so that the natural period of their mechanical system operates at the proper frequency which is usually a few cycles per second above or below the frequency of the driving impulses.

The principal object of the present invention is the provision of a simplified structure for a vibratory motor making the device readily assembled, thus decreasing its cost and at the same time providing a means vfor tuning the natural period of vibration of the vibratory motor.

Another object is the provision of a simplified vibratory motor that is enclosedand dust proof.

Another object is the provision of an offset mounting for a vibrator.

Another object is the provision of an elastomer for supporting the armature which is pre-loaded under tension to tune the natural period of vibration.

Other objects and advantages appear hereinafter in the following description and claims.

The accompanying drawings show for the purpose of exemplification Without limiting the invention or claims thereto, certain practical embodiments illustrating the principles of this invention wherein:

Fig. 1 is a sectional view of the vibratory motor comprising this invention.

Fig. 2 is a plan. viewof the under side of the motor asshown in Fig. 1.

Fig. 3 is a perspective view of a modified form of the vibrator comprising this invention.

Fig. 4 is a detailed view of one of the elastomers employed in Fig. 3.

Referring to the drawings, the mounting bar 1 is in the form of a strap metal member bent intermediate its ends as indicated at 2 and provided with a hole 3 for mounting the same on the member to be vibrated. The mounting hole 3 is ofiset from the center of the vibrator which is marked on the mounting bar 1 by the hole 4 which receives the stud member 5 that is secured within the core member 6 of magnetizable material.

The stud member 5 is provided with a lock washer and nut and clamps the reactive base mounted core member 7 which is made up of a series of circular disc laminations that are slotted as indicated at 8 and are provided in different diameters so as to produce the annular groove 10. The groove 10 is formed by having large discs forming the base 7 in the number of four l-aminations as indicated at 11 and eight laminations forming the groove indicated at 10 and five laminations forming the upper flange 12 defining the groove 10. These laminations are tightly clamped by the stud 5 to be between the core 6. The core 6 has mounted thereon the coil member 13 which is mounted on the usual spool 14 and is held in assembled relation by means of the horseshoe clamp ring as indicated at 15 which fits in the cooperating groove 17 in the perimetral surface of the core 6. Thus the coil is held firmly against the circular disc laminations forming the reaction base 7.

A locking pin member 16 passes through the base strap 1 into the core reactor base 7. The openings 18 and -19 pass through the reactor base 7 and the strapmember 1 to carry the terminal leads from the'coil 13. These leads 20 may be connected directly to the alternating current frequency or they may be provided with alternate half wave electrical impulses by providing some form of half wave rectification between the; alternating current supply and the coil.; Sucha circuit ordinarily includes a means for varying the voltage such as a rheostat to thereby change the amplitude of vibration of the vibrator.

The cap member 21: is made of magnetizable material and is in the form of a bell having a, central opening 22 which is disposed axially of the core 6 and is threaded to receive the adjusting screw 23-Which may be locked in place by the nut 24 and which is provided with a screwdriver slot 25 for adjusting the same. The innerend of the adjusting screw 25 is provided with a pointed head 26 which is seated in the dished washer 27, the washerbeing provided with a flange to receive the spring 28. The spring 28 being positioned against the bottom of thechamber 30 axially of the core 6. The helical spring 28 thus rtendsto force the bell capor armature member 21 upwardly and this cap is provided with an annular groove.v member as indicated at 31 to receive an annular flange and the flange 34 mates in the groove 10 formed in the reaction base 7.

This rubber spring member 33 is made of resilientelastcmer and is required to be snapped in place around the perimeter ofthe armature cap member 21 and the reaction base 7 to thus grip and tightly hold the same.

The cooperating flanges keep the armature cap and the reactive base member from having any axial movement relative to the annular rubber spring member 33. When the adjusting screw 23 is turned downwardly so as to compress the spring 28, the latter causes thearmature bell member to place the annular rubber spring 33 under tension and thereby tune the mechanical period of the vibrator. This structure thus completely encloses the coil and the elastomer spring member 33 is thus placed under tension by the spring 28 so as to tune the vibrator to operate at a proper frequency. The armature bell cap member 21 will thus vibrate up and down and create the proper vibratory action. The reaction base 7 and the mounting bar 1 Will of course likewise vibrate as every reactive base is supposed to do. However, there will be some flenture in the mounting bar 1 in that it is disposed at a definite radius from the central axis of the vibrator to the mounting hole 3 which in combination produces the vibration that will tend to rock somewhat on the mounting bolt as well as provide the vibratory action. This is novel vibratory motion when applied to a bin as it tends to produce a different character of ripple and one should be assured of preventing the tearing of the metal around the bolt that goes through the mounting hole 3 of the mounting bar 1.

The structure as shown in Fig. 3 the bell member armature has been replaced by the C-shaped laminated armature member 35 which is provided with the same mounting screw 23 and the coil 13 is also the same. However, the core 6 is secured to a cross member such as indicated by the bar 36 which in effect is a secondary laminated armature forming part of the core of the coil and being secured to the core 6 in the same manner as that shown in Fig. 1, The base 37 is somewhat heavier than the base of the mounting bar shown in Fig. l and is provided with holes 38 for securing the same to the member to be vibrated. 7 The ends of the core reaction member 36 are inserted intorubber sleeves as indicated at 40. Each sleeve has an opening 41 which snugly snaps over the end of the core bar 36 and is provided with an annular flange such as indicated at 42 that locks in an annular groove in the core to keep therubber from accidentally being pulled off the end of the bar 36. The ends of the armature 35 likewise has an annular flange which is held by the flange 43 and defines the opening 44 in the top of the rubber member 40 and thus pulls the armature relative to the straight core member 36. By manipulating the adjusting screw 23 these elastomer members 40 may be stretched so as to properly tune the device and thus the elastomer is placed under tension for the purpose of tuning the same and functions in the same manner as that described in relation to Fig. 1.

I claim:

1. An electromagnetic vibrator having a reaction base with a core extending through a coil to provide opposite pole faces and a resiliently mounted armature characterized in that the reaction base includes the core which extends transversely beyond one end of the coil, and an elastomer means embracing the core extension and the armature resiliently mounting the latter in spaced relation with the core to provide operative air gaps therebetween, said transverse core section is a slotted annulus and the armature is bell-shaped with the elastomer being annular to completely close said annulus and bell.

2. The vibrator of claim 1 characterized in that said annular core and bell-shaped armature have indentations to receive projections on said annular elastomer.

3. An electromagnetic vibrator consisting of a reaction base including a mounting member and a magnetizable member, a core secured to said magnetizable member and extending upwardly therefrom, a coil on said core the transverse dimension of which is less than said magnetizable member, an armature member extending over the free end of the core and down within close proximity of said magnetizable member to produce symmetrical air gaps between said magnetizable member and said core, resilient means seated on said core, an adjustable member secured to said armature and engaging said resilient means, elastomer means embracing said magnetizable member and said armature under tension to exert a force counteracting the force of said resilient means and maintaining the air gap between said armature and said magnetizable member, said core adjacent said armature is hollowed to receive said resilient means, a washer engaging the other end of said resilient means, and said adjustable member extending through said armature to engage said washer and to be effective on said resilient means to change the tension on said elastomer means and vary the air gap, said armature means is bell-shaped and said magnetizable member is circular and said elastomer means is annular to engage both members.

4. An electromagnetic vibrator consisting of a reaction base including a mounting member and a magnetizable member, a core secured to said magnetizable member and extending upwardly therefrom, a coil on said core the transverse dimension of which is less than said magnetizable member, an armature member extending over the free end of the core and down within close proximity of said magnetizable member to produce symmetrical air gaps between said magnetizable member and said core, resilient means seated on said core, an adjustable member secured to said armature and engaging said resilient means, elastomer means embracing said magnetizable member and said armature under tension to exert a force counteracting the force of said resilient means and maintaining the air gap between said armature and said magnetizable member, said core adjacent said armature is hollowed to receive said resilient means, a washer engaging the other end of said resilient means, and said adjustable member extending through said armature to engage said washer and to be effective on said resilient means to change the tension on said elastomer means and vary the air gap, said magnetizable member is in the shape of a bar and said elastomer means is in two parts one capping each end of said bar in two parts, each part having angularly disposed openings with flanges for embracing and grasping said magnetizable member and armature.

References Cited in the file of this patent UNITED STATES PATENTS 2,097,455 Fisher Nov. 2, 1937 2,206,244 Weyandt July 2, 1940 2,458,545 Weyandt Jan. 11, 1949 2,472,637 Weyandt June 7, 1949 FOREIGN PATENTS 460,957 'Italy June 5, 1951 741,536 Great Britain 2 Dec; 7, 1955 

